1 feel that one of my main duties ______ a teacher is to help the students to become better learners.
| A．for | B．by | C．as | D．with |
Beijing has ________ many buses that there is often a traffic jam in rush hours,
| A．so | B．very | C．too | D．much |
Hurry up, ________ you will miss the train. It's leaving in ten minutes.
| A．and | B．so | C．however | D．or |
Not only his parents but also his brother ________ to the Summer Palace. They haven't
been back.
| A．have been | B．have gone | C．has been | D．has gone |
You'd better do it ________ your mother did.
| A．when | B．as | C．like | D．because |
______ they are brothers, they don't look like each other at all.
| A．Because | B． Though | C．When | D． As |